Louis L’Amour was a prolific writer period. He wrote hundreds of novels about everything from sports to bare-knuckle tramp steamer captains.
And he had the personal experience and knowledge to do so!
But the Westerns made him the most money and garnered him the most fame.
The bookstore in my home town had an entire wall dedicated to his western novels. He was still writing at the time and I remember thinking to myself ‘that wall isn’t going to be big enough.’
I recently read his biography. He was an interesting guy.